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This contribution deals with research results focused on analysis of renovative layers applied by thermal spraying. There were two types of sprayed wires used - formerly used S-NiCro 80/20 and new cored wire marked DURMAT. Micro hardness of thermally sprayed coatings was measured by Vickers indenter, wear resistance of coatings was checked by erosion test, simulated by abrasive grit blasting. EDX analysis proved the presence of particular structural phases. Higher micro hardness values were found in DURMAT coating and this property led to higher wear resistance of this coating in comparison with previously used S-NiCro 80/20 coating. Test results showed that new coating marked DURMAT-AS-7641 has better properties in comparison with previously used coating from perspective of chemical composition, micro hardness and also erosive wear evaluation. Part of the experimental work was to determine the electrochemical characteristics of blasted surfaces using the EIS (electrochemical impedance spectroscopy) method.

Evaluation of the Quality of the Renovation Layers Applied by Thermal Spraying Technology